A_C Diagnostics Chart

A/C Diagnostics Chart A/C Diagnostics Chart

A/C System Concern Compressor Inoperative		Potential Causes Electrical Wiring Issue No or Low Refrigerant Charge (Greater than – .07 kg /– 0.154 lbs) Compressor Internal Malfunction Compressor Clutch Malfunction A/C Pressure Sensor Malfunction Evaporator Air Temperature (EAT) Malfunction HVAC Controls Malfunction
Low Side Gauge Reading	High Side Gauge Reading	Potential Causes
Same as High Side	Same as Low Side	No or Low Refrigerant Charge (Greater than – .07 kg /– 0.154 lbs)
		Compressor Malfunction
		A/C Pressure Sensor Malfunction
		EAT Malfunction
		HVAC Controls Malfunction
Normal	Normal	Temperature Actuator Malfunction
		Temperature Door Malfunction

A/C System Concern		Potential Causes
Low	Low	Low Refrigerant Charge (Greater than – .07 kg /– 0.154 lbs)
		Restriction between the Compressor Outlet and Low Side Port
	Low/Normal	Evaporator Freezing/EAT Malfunction
	High	Compressor Stuck at Maximum Displacement/EAT Malfunction
Normal/High	Normal/High	Air Conditioning Oil Overcharge
High	Low	Restriction between the Low Side Port and Compressor Inlet
		Expansion Device Stuck Open
		Compressor has Low Displacement or Internal Malfunction
	High	Malfunctioning Cooling Fans
		Refrigerant Overcharge (Greater than + .03 kg /+ 0.066 lbs)
		Restricted Condenser Air Flow
		Air in A/C System
Note: Restrictions can occur in any part of an A/C system and may result in various gauge pressure values, depending on the system design and service port locations. The use of a non-contact, infrared thermometer can help diagnose a restricted A/C system with the ability to quickly observe significant, unexpected temperature changes in components and plumbing due to debris, contamination, pinched/damaged hoses, etc. Note: This vehicle has a refrigerant charge operational tolerance of – .07 kg to + .03 kg / – 0.154 lbs to + 0.066 lbs. If refrigerant charge falls outside of this range, please refer to Air Conditioning (A/C) System Performance Test.